1. recieved a good or service as a favor
2. to make out with someone
3. to have sex with someone

1. Jerry gave me the hook up with those backstage passes.
2. Sandra and I hooked up last night and her adams apple was kinda big
3. Hooking up with Derick last night was the biggest mistake in my life.

verb: to engage in any type of sexual activity.
noun: 1. purposely ambiguous, equivocal word to describe almost any sexual action. usually used to exaggerate or minimize what exactly happened. a hook-up can range from a make-out session to full out sex.
2. person you hook up with

a: "so what did you guys do last night."
b: "welll, you know...we hooked up."
a: "come on! that could mean anything. give me details!